How water resources are being polluted and how can we conserve them ?

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

What causes darkening of the skin as melanin production increases

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?